How to use 'alter session...' in apex

Hello everyone, in my APEX program, I need to alter the parameter nls_date_language with 'alter session set nls_date_language = american'.
I execute the statement in SQL Commands of APEX, but it doesn't seem it works. how can I change the parameter--nls_date_language in APEX?
Any answer is appreciated.

Hi,
This might help
http://download.oracle.com/docs/cd/E14373_01/appdev.32/e11838/bldr.htm#BABGGAJE
>
Application Date Format
Determines the date format to be used in the application.
This date format is used to alter the NLS_DATE_FORMAT database session setting before showing or submitting any page in the application. This value can be a literal string containing a valid Oracle date format mask or an item reference using substitution syntax. If no value is specified, the default date format is derived from the database session at runtime.
>
Br,Jari

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